diff --git a/src/main/java/ninja/S3Dispatcher.java b/src/main/java/ninja/S3Dispatcher.java
index e0f5625..317d3e7 100644
--- a/src/main/java/ninja/S3Dispatcher.java
+++ b/src/main/java/ninja/S3Dispatcher.java
@@ -734,8 +734,8 @@ private void copyObject(WebContext webContext, Bucket bucket, String id, String
                               String.format("Source '%s' must contain '/'", copy));
             return;
         }
-        String srcBucketName = copy.substring(1, copy.lastIndexOf(PATH_DELIMITER));
-        String srcId = copy.substring(copy.lastIndexOf(PATH_DELIMITER) + 1);
+        String srcBucketName = copy.substring(1, copy.indexOf(PATH_DELIMITER, 1));
+        String srcId = copy.substring(copy.indexOf(PATH_DELIMITER, 1) + 1);
         Bucket srcBucket = storage.getBucket(srcBucketName);
         if (!srcBucket.exists()) {
             signalObjectError(webContext,